Resonator



Dec. 25, 1928. 1,696,524

E. P. COLE RESONATOR Filed Sept. so, 1926 Patented Dec. 25, 1928.

,TsES

ELLIS PRENTICE COLE,

or CHICAGO; ILLINOIS.

RESONATOR.

Application filed September 30, 1926. Serial No. 138,659.

'Tl1is--invention -relates to .resonato'rs or sound amplifiers of the kind used, for example, in connection with radio loud speaker apparatus, or in connection with phonograph or talking machine construction.

Generally speaking, the object of the invention is to provide a novel and improved construction whereby a resonator or sound amplifier of this general character may be adjusted to in effect lengthen or shorten the passage for the sound waves therein, thereby in effect to tune the resonator or amplifier in accordance with the requirements of the desired results regarding clearness and quality of tone,

It is also an object to provide certain details and features of construction tending to increase the general efliciency and the desir ability of an adjustable resonator or sound amplifier of this particular character.

To the foregoing and other useful ends, the invention consists in matters hereinafter set forth and claimed and shown in the accompanying drawings in which Fig. 1 is a longitudinal section of a resonator or sound amplifier embodying the principles of the invention.

Fig. 2 is a similar view showing another form of the invention.

As thus illustrated, and referring to Fig. 1, the invention comprises a gradually increasing or expanding passage 1, and a larger and gradually increasing or expanding passage 2, arranged side by side, and connected by the elbow passage portion 3, in the manner shown, so that the sound waves entering at 4 will ultimately escape from the mouth or hell 5 of the resonator. An opening 6 is provided, from the passage 1 into the passage 2, at the adjacent sides o the two passages. A deflector 7 is hinged to the edge of said opening at 8, and a rod 9 is provided with ahandle 10 and arranged in position to operate said deflector. Vhen the deflector is in position to close the opening. the sound waves will traverse the entire passage formed by the two passages 1 and 2. as shown. However, when the deflector 7 is open, then the sound waves, or some of them. will be deflected through this opening 6 and into the passage 2, thus forming a sort of bypass to cut out the elbow portion 3 when such is desired.

Fig. 2 shows a similar construction, but in this case there are three sound passage portions 11, 12, and 13, and the by-pass opening 14 is fromthe passagelQ. into thepassagell, as shown. The same handleand rod is used here for adjusting the deflector.

With this construction, the entire sound wave passage is in effect lengthened and shortened to suit the requirements regarding the clearness and quality and other characteristics of the tones to be amplified and produced by the resonator or sound amplifier. It is well known that a horn of suflicient length, for example, to reproduce the lower tones, sometimes exaggerates them, depending upon various things. However, if a part of the sound waves is diverted through the by-pass opening, the high and low tones may be balanced, so to speak, and in addition the high or low tones may be accentuated as may be desired. In other words, the resonator or sound amplifier can be tuned to produce the clearness and quality and other characteristics of tone that may be desired.

As shown, the sound passage in each form of the invention is round in cross section, but it is obvious that the sound passage may be square or polygonal in cross section, in any desired manner, without departing from the spirit of the invention.

The telephonic reproducing or receiving in strument 17, shown at the inlet end of each form of the invention, in Figs. 1 and 2, may be of any suitable character, such as those employed for radio loud speakers, or it may be a reproducer of the kind employed on phonographs or talking machines, such as those that have a diaphragm and means for vibrating it either electrically or mechanically.

In each form of the invention there is only one outlet for the sound waves, regardless of whether the valve is open or not, for in each form of the invention the sound waves are compelled to escape into the atmosphere through one and the same opening, regardless of whether the valve is open or closed or partially open.

Without disclaiming anything, and without prejudice to any novelty disclosed, what I claim as my invention is:

1. In a resonator or sound amplifier, the combination of a passage for the sound waves, of gradually increasing cross sectional area, an opening at one side of said passage, and a deflector disposed in position to control said opening, adapted in one position to close said opening and adapted in another position to deflect the sound wat'es through said opening,

vtogether-with means for adjustin said deflector, the resonator having a sing e expanded sound outlet for both the sound Waves traversing the outer passage thereof and for 5 those passing through said opening.

2. A structure as specified in claim '1, said passage having portions thereof arranged side by side, and said'opening serving to permit the sound Wavesto escape from one portion of said passage into another portion thereof, thus. serving as a' by-pass for the sound waves.-

3. A structure as specified in claim 1, said defiectoncomprising a plate hinged at one edge thereof, adapted to swing into position to close the passage and thereby deflect all of said sound waves out through said opening. Specifioation signed this 21st day of Sept,

ELLIS PRENTIC E COLE. 

